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| 1 <!-- |
| 2 @license |
| 3 Copyright (c) 2015 The Polymer Project Authors. All rights reserved. |
| 4 This code may only be used under the BSD style license found at http://polymer.g
ithub.io/LICENSE.txt |
| 5 The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt |
| 6 The complete set of contributors may be found at http://polymer.github.io/CONTRI
BUTORS.txt |
| 7 Code distributed by Google as part of the polymer project is also |
| 8 subject to an additional IP rights grant found at http://polymer.github.io/PATEN
TS.txt |
| 9 --> |
| 10 |
| 11 <link rel="import" href="../polymer/polymer.html"> |
| 12 <link rel="import" href="../iron-resizable-behavior/iron-resizable-behavior.html
"> |
| 13 |
| 14 <!-- |
| 15 `paper-scroll-header-panel` contains a header section and a content section. Th
e |
| 16 header is initially on the top part of the view but it scrolls away with the |
| 17 rest of the scrollable content. Upon scrolling slightly up at any point, the |
| 18 header scrolls back into view. This saves screen space and allows users to |
| 19 access important controls by easily moving them back to the view. |
| 20 |
| 21 __Important:__ The `paper-scroll-header-panel` will not display if its parent do
es not have a height. |
| 22 |
| 23 Using [layout attributes](http://www.polymer-project.org/docs/polymer/layout-att
rs.html), you can easily make the `paper-scroll-header-panel` fill the screen |
| 24 |
| 25 <body class="fullbleed layout vertical"> |
| 26 <paper-scroll-header-panel class="flex"> |
| 27 <paper-toolbar> |
| 28 <div>Hello World!</div> |
| 29 </paper-toolbar> |
| 30 </paper-scroll-header-panel> |
| 31 </body> |
| 32 |
| 33 or, if you would prefer to do it in CSS, just give `html`, `body`, and `paper-sc
roll-header-panel` a height of 100%: |
| 34 |
| 35 html, body { |
| 36 height: 100%; |
| 37 margin: 0; |
| 38 } |
| 39 paper-scroll-header-panel { |
| 40 height: 100%; |
| 41 } |
| 42 |
| 43 `paper-scroll-header-panel` works well with `paper-toolbar` but can use any elem
ent |
| 44 that represents a header by adding a `core-header` class to it. |
| 45 |
| 46 <paper-scroll-header-panel> |
| 47 <paper-toolbar>Header</paper-toolbar> |
| 48 <div>Content goes here...</div> |
| 49 </paper-scroll-header-panel> |
| 50 |
| 51 Styling scroll-header-panel: |
| 52 |
| 53 To change background for toolbar when it is at its full size: |
| 54 |
| 55 paper-scroll-header-panel { |
| 56 --paper-scroll-header-panel-full-header: { |
| 57 background-color: red; |
| 58 }; |
| 59 } |
| 60 |
| 61 To change the background for toolbar when it is condensed: |
| 62 |
| 63 paper-scroll-header-panel { |
| 64 --paper-scroll-header-panel-condensed-header: { |
| 65 background-color: #f4b400; |
| 66 }; |
| 67 } |
| 68 |
| 69 @group Paper Element |
| 70 @element paper-scrollheader-panel |
| 71 @demo demo/index.html |
| 72 @hero hero.svg |
| 73 --> |
| 74 |
| 75 <dom-module id="paper-scroll-header-panel"> |
| 76 |
| 77 <style> |
| 78 :host { |
| 79 display: block; |
| 80 position: relative; |
| 81 overflow: hidden; |
| 82 } |
| 83 |
| 84 #mainContainer { |
| 85 position: absolute; |
| 86 top: 0; |
| 87 right: 0; |
| 88 bottom: 0; |
| 89 left: 0; |
| 90 box-sizing: border-box; |
| 91 -moz-box-sizing: border-box; |
| 92 -webkit-overflow-scrolling: touch; |
| 93 overflow-x: hidden; |
| 94 overflow-_y: auto; |
| 95 -webkit-transform: translateZ(0); |
| 96 transform: translateZ(0); |
| 97 } |
| 98 |
| 99 #headerContainer { |
| 100 position: absolute; |
| 101 top: 0; |
| 102 right: 0; |
| 103 left: 0; |
| 104 } |
| 105 |
| 106 .bg-container { |
| 107 position: absolute; |
| 108 top: 0; |
| 109 left: 0; |
| 110 width: 100%; |
| 111 height: 100%; |
| 112 overflow: hidden; |
| 113 } |
| 114 |
| 115 #headerBg { |
| 116 @apply(--paper-scroll-header-panel-full-header); |
| 117 } |
| 118 |
| 119 #condensedHeaderBg { |
| 120 @apply(--paper-scroll-header-panel-condensed-header); |
| 121 } |
| 122 |
| 123 #headerBg, #condensedHeaderBg { |
| 124 position: absolute; |
| 125 top: 0; |
| 126 left: 0; |
| 127 width: 100%; |
| 128 height: 100%; |
| 129 background-repeat: no-repeat; |
| 130 background-size: cover; |
| 131 background-position: center center; |
| 132 } |
| 133 |
| 134 #condensedHeaderBg { |
| 135 opacity: 0; |
| 136 } |
| 137 </style> |
| 138 <template> |
| 139 <div id="mainContainer"> |
| 140 <content id="mainContent" select=":not(paper-toolbar):not(.paper-header)">
</content> |
| 141 </div> |
| 142 <div id="headerContainer"> |
| 143 <div class="bg-container"> |
| 144 <div id="condensedHeaderBg"></div> |
| 145 <div id="headerBg"></div> |
| 146 </div> |
| 147 <content id="headerContent" select="paper-toolbar, .paper-header"></conten
t> |
| 148 </div> |
| 149 </template> |
| 150 </dom-module> |
| 151 |
| 152 <script> |
| 153 (function() { |
| 154 |
| 155 'use strict'; |
| 156 |
| 157 Polymer({ |
| 158 |
| 159 /** |
| 160 * Fired when the content has been scrolled. |
| 161 * |
| 162 * @event content-scroll |
| 163 */ |
| 164 |
| 165 /** |
| 166 * Fired when the header is transformed. |
| 167 * |
| 168 * @event paper-header-transform |
| 169 */ |
| 170 |
| 171 is: 'paper-scroll-header-panel', |
| 172 |
| 173 behaviors: [ |
| 174 Polymer.IronResizableBehavior |
| 175 ], |
| 176 |
| 177 properties: { |
| 178 |
| 179 /** |
| 180 * If true, the header's height will condense to `_condensedHeaderHeight` |
| 181 * as the user scrolls down from the top of the content area. |
| 182 */ |
| 183 condenses: { |
| 184 type: Boolean, |
| 185 value: false, |
| 186 observer: '_condensesChanged' |
| 187 }, |
| 188 |
| 189 /** |
| 190 * If true, no cross-fade transition from one background to another. |
| 191 */ |
| 192 noDissolve: { |
| 193 type: Boolean, |
| 194 value: false |
| 195 }, |
| 196 |
| 197 /** |
| 198 * If true, the header doesn't slide back in when scrolling back up. |
| 199 */ |
| 200 noReveal: { |
| 201 type: Boolean, |
| 202 value: false |
| 203 }, |
| 204 |
| 205 /** |
| 206 * If true, the header is fixed to the top and never moves away. |
| 207 */ |
| 208 fixed: { |
| 209 type: Boolean, |
| 210 value: false |
| 211 }, |
| 212 |
| 213 /** |
| 214 * If true, the condensed header is always shown and does not move away. |
| 215 */ |
| 216 keepCondensedHeader: { |
| 217 type: Boolean, |
| 218 value: false |
| 219 }, |
| 220 |
| 221 /** |
| 222 * The height of the header when it is at its full size. |
| 223 * |
| 224 * By default, the height will be measured when it is ready. If the heigh
t |
| 225 * changes later the user needs to either set this value to reflect the |
| 226 * new height or invoke `measureHeaderHeight()`. |
| 227 */ |
| 228 headerHeight: { |
| 229 type: Number, |
| 230 value: 0 |
| 231 }, |
| 232 |
| 233 /** |
| 234 * The height of the header when it is condensed. |
| 235 * |
| 236 * By default, `_condensedHeaderHeight` is 1/3 of `headerHeight` unless |
| 237 * this is specified. |
| 238 */ |
| 239 condensedHeaderHeight: { |
| 240 type: Number, |
| 241 value: 0 |
| 242 }, |
| 243 |
| 244 /** |
| 245 * By default, the top part of the header stays when the header is being |
| 246 * condensed. Set this to true if you want the top part of the header |
| 247 * to be scrolled away. |
| 248 */ |
| 249 scrollAwayTopbar: { |
| 250 type: Boolean, |
| 251 value: false |
| 252 }, |
| 253 |
| 254 _headerMargin: { |
| 255 type: Number |
| 256 }, |
| 257 |
| 258 _prevScrollTop: { |
| 259 type: Number |
| 260 }, |
| 261 |
| 262 _y: { |
| 263 type: Number |
| 264 } |
| 265 |
| 266 }, |
| 267 |
| 268 observers: [ |
| 269 '_setup(_headerMargin, headerHeight, fixed)', |
| 270 '_headerHeightChanged(headerHeight, condensedHeaderHeight)', |
| 271 '_condensedHeaderHeightChanged(headerHeight, condensedHeaderHeight)' |
| 272 ], |
| 273 |
| 274 listeners: { |
| 275 'iron-resize': 'measureHeaderHeight' |
| 276 }, |
| 277 |
| 278 ready: function() { |
| 279 this.async(this.measureHeaderHeight, 5); |
| 280 this._scrollHandler = this._scroll.bind(this); |
| 281 this.scroller.addEventListener('scroll', this._scrollHandler); |
| 282 }, |
| 283 |
| 284 detached: function() { |
| 285 this.scroller.removeEventListener('scroll', this._scrollHandler); |
| 286 }, |
| 287 |
| 288 /** |
| 289 * Returns the header element. |
| 290 * |
| 291 * @property header |
| 292 * @type Object |
| 293 */ |
| 294 get header() { |
| 295 return Polymer.dom(this.$.headerContent).getDistributedNodes()[0]; |
| 296 }, |
| 297 |
| 298 /** |
| 299 * Returns the content element. |
| 300 * |
| 301 * @property content |
| 302 * @type Object |
| 303 */ |
| 304 get content() { |
| 305 return Polymer.dom(this.$.mainContent).getDistributedNodes()[0]; |
| 306 }, |
| 307 |
| 308 /** |
| 309 * Returns the scrollable element. |
| 310 * |
| 311 * @property scroller |
| 312 * @type Object |
| 313 */ |
| 314 get scroller() { |
| 315 return this.$.mainContainer; |
| 316 }, |
| 317 |
| 318 /** |
| 319 * Invoke this to tell `paper-scroll-header-panel` to re-measure the header'
s |
| 320 * height. |
| 321 * |
| 322 * @method measureHeaderHeight |
| 323 */ |
| 324 measureHeaderHeight: function() { |
| 325 var header = this.header; |
| 326 if (header && header.offsetHeight) { |
| 327 this.headerHeight = header.offsetHeight; |
| 328 } |
| 329 }, |
| 330 |
| 331 _headerHeightChanged: function() { |
| 332 if (!this.condensedHeaderHeight) { |
| 333 // assume condensedHeaderHeight is 1/3 of the headerHeight |
| 334 this.condensedHeaderHeight = this.headerHeight * 1 / 3; |
| 335 } |
| 336 }, |
| 337 |
| 338 _condensedHeaderHeightChanged: function() { |
| 339 if (this.headerHeight) { |
| 340 this._headerMargin = this.headerHeight - this.condensedHeaderHeight; |
| 341 } |
| 342 }, |
| 343 |
| 344 _condensesChanged: function() { |
| 345 if (this.condenses) { |
| 346 this._scroll(); |
| 347 } else { |
| 348 // reset transform/opacity set on the header |
| 349 this._condenseHeader(null); |
| 350 } |
| 351 }, |
| 352 |
| 353 _setup: function() { |
| 354 var s = this.scroller.style; |
| 355 s.paddingTop = this.fixed ? '' : this.headerHeight + 'px'; |
| 356 |
| 357 s.top = this.fixed ? this.headerHeight + 'px' : ''; |
| 358 |
| 359 if (this.fixed) { |
| 360 this._transformHeader(null); |
| 361 } else { |
| 362 this._scroll(); |
| 363 } |
| 364 }, |
| 365 |
| 366 _transformHeader: function(y) { |
| 367 var s = this.$.headerContainer.style; |
| 368 this._translateY(s, -y); |
| 369 |
| 370 if (this.condenses) { |
| 371 this._condenseHeader(y); |
| 372 } |
| 373 |
| 374 this.fire('paper-header-transform', {y: y, height: this.headerHeight, |
| 375 condensedHeight: this.condensedHeaderHeight}); |
| 376 }, |
| 377 |
| 378 _condenseHeader: function(y) { |
| 379 var reset = (y === null); |
| 380 |
| 381 // adjust top bar in core-header so the top bar stays at the top |
| 382 if (!this.scrollAwayTopbar && this.header.$ && this.header.$.topBar) { |
| 383 this._translateY(this.header.$.topBar.style, |
| 384 reset ? null : Math.min(y, this._headerMargin)); |
| 385 } |
| 386 // transition header bg |
| 387 var hbg = this.$.headerBg.style; |
| 388 if (!this.noDissolve) { |
| 389 hbg.opacity = reset ? '' : (this._headerMargin - y) / this._headerMargin
; |
| 390 } |
| 391 // adjust header bg so it stays at the center |
| 392 this._translateY(hbg, reset ? null : y / 2); |
| 393 // transition condensed header bg |
| 394 if (!this.noDissolve) { |
| 395 var chbg = this.$.condensedHeaderBg.style; |
| 396 chbg = this.$.condensedHeaderBg.style; |
| 397 chbg.opacity = reset ? '' : y / this._headerMargin; |
| 398 |
| 399 // adjust condensed header bg so it stays at the center |
| 400 this._translateY(chbg, reset ? null : y / 2); |
| 401 } |
| 402 }, |
| 403 |
| 404 _translateY: function(s, y) { |
| 405 var t = (y === null) ? '' : 'translate3d(0, ' + y + 'px, 0)'; |
| 406 setTransform(s, t); |
| 407 }, |
| 408 |
| 409 _scroll: function(event) { |
| 410 if (!this.header) { |
| 411 return; |
| 412 } |
| 413 |
| 414 var sTop = this.scroller.scrollTop; |
| 415 |
| 416 this._y = this._y || 0; |
| 417 this._prevScrollTop = this._prevScrollTop || 0; |
| 418 |
| 419 var y = Math.min(this.keepCondensedHeader ? |
| 420 this._headerMargin : this.headerHeight, Math.max(0, |
| 421 (this.noReveal ? sTop : this._y + sTop - this._prevScrollTop))); |
| 422 |
| 423 if (this.condenses && this._prevScrollTop >= sTop && sTop > this._headerMa
rgin) { |
| 424 y = Math.max(y, this._headerMargin); |
| 425 } |
| 426 |
| 427 if (!event || !this.fixed && y !== this._y) { |
| 428 this._transformHeader(y); |
| 429 } |
| 430 |
| 431 this._prevScrollTop = Math.max(sTop, 0); |
| 432 this._y = y; |
| 433 |
| 434 if (event) { |
| 435 this.fire('content-scroll', {target: this.scroller}, this, false); |
| 436 } |
| 437 } |
| 438 |
| 439 }); |
| 440 |
| 441 //determine proper transform mechanizm |
| 442 if (document.documentElement.style.transform !== undefined) { |
| 443 var setTransform = function(style, string) { |
| 444 style.transform = string; |
| 445 } |
| 446 } else { |
| 447 var setTransform = function(style, string) { |
| 448 style.webkitTransform = string; |
| 449 } |
| 450 } |
| 451 |
| 452 })(); |
| 453 |
| 454 </script> |
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Chromium Code Reviews
Issue 1162563004:
Upgrade to 1.0 and switch clients to dom-repeat where needed. (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master